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wireless sniffing using pcap, MAC address filter
pcap_lookupnet(dev,&net,&mask,errbuf);
    printf("%sn",errbuf);
    /* Open the session in promiscuous mode */
    handle = pcap_open_live(dev, BUFSIZ, 1, 1000, errbuf);
    if (handle == NULL) {
        printf("Couldn't open device %s: %sn", dev, errbuf);
        return 2;
    }
    if(pcap_compile(handle,&fp,argv[0],0,net)==-1){
        fprintf(stderr,"Error calling pcap_compilen");exit(1);}
    if(pcap_setfilter(handle,&fp) == -1){
        fprintf(stderr,"Error setting filtern");exit(1);}
    /* The call pcap_loop() and pass our callback function */
    pcap_loop(handle, 10, my_callback, NULL);